Question

If the radius of a circle is increased by 50percent. Its area is increased by

Answer 1

Correct Answer:

C) 125%

Description for Correct answer:

[πr2(2.25−1)×100/πr2]% = 125%

Answer 2

Here is your answer

Area of circle = π r^2

If radius is increased by 50%
so Radius is 1.5

Hence Difference in area is
$= (1.5) {}^{2} - 1 {}^{2} \\ = 2.25 - 1 \\ = 1.25$
Therefore Area is increased by
$= \frac{1.25}{1} \times 100 \\ = 125\%$
Hope it helps you